Cobaltfrog
I don't think the DS solution stands up to the reasonable man test.
You'd look a right tart wearing RAF wings on a naval uniform - where to put them? over the sleeve rank or on the breast? If you're employed as a pilot in the RN surely you should wear navy wings even if your original military flying course was with the RAF or AAC.
Similarly AAC or RN wings on an RAF No 1 just wouldn't look right. I seem to recall RAF regulations require you to wear the flying badge of the specialisation you are employed in. Thus an ex AEOp now a WSO/Nav wears N brevet (or new WSO brevet) if he is currently filling that role. If he is not in role (say on an ops support tour as an ops or int officer) he can wear any (RAF) flying badge he is entitled to. Knew one such rather ancient beast who used to wear S on his working dress, RO on his mess kit and N on his No 1! He was an ops officer at 6 FTS at the time had started as NCA on Shackletons, become a commissioned Radar Observer on Javelins and then a Navigator instructor before hanging up his flying helemt and goggles.